The main difference is the xbox one has a slightly faster bus, 30gb vs "nearly 20", the Ps4 deals with just cpu and gpu coherency, while xbo also allows coherency between other silicon (sound, and other dedicated silicon) as well.

The main difference is the xbox one has a slightly faster bus, 30gb vs "nearly 20", the Ps4 deals with just cpu and gpu coherency, while xbo also allows coherency between other silicon (sound, and other dedicated silicon) as well.

AMD has already confirmed that neither has hUMA. That's straight from the horses mouth.